Carbon is the most important hardening element in steel. Silicon helps to strengthen the strength. Like manganese, silicon is used to maintain the strength of steel during steel production. Manganese is the important austenite stabilizing elements contribute to the formation of texture structure and increase the firmness, strength and wear resistance. Phosphorus is a harmful element. Reducing the plasticity and toughness of steel and appearing cold brittleness.

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ASTM D ASTM D ASTM A Designation: A — 01 Standard Speci? A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense. Scope 1. Referenced Documents 2. Ordering Information 3.

Materials and Manufacture 4. Chemical Composition and Analysis 5. Other compositions may be speci? The chemical composition thus determined shall conform to the requirements speci? Permissible variations in product analysis shall be in accordance with Speci?

Dimensions, Mass, and Permissible Variations 6. Current edition approved Dec. Published February Originally published as A — Last previous edition A — Intentional additions of calcium or calcium alloys for deoxidation or inclusion shape control are not permitted unless speci?

D Oxygen content applies to product analysis and shall be determined in accordance with Test Methods E Quality Assurance 7. The supplier shall be required to report on the results of the macroetch and micro-inclusion rating tests detailed below. Quality tests shown in 7. Tests may be made on smaller or larger sections by agreement with the purchaser. A minimum 3 to 1 reduction of rolled billets or forged sections is required for strand cast products.

One ingot shall be taken at random from the? When two usable plates constitute a heat, two of the sample ingots shall be selected from the second usable plate poured. Where a single usable plate constitutes a heat, any three random ingots may be selected.

Other methods of sampling shall be as agreed upon by manufacturer and purchaser. At least one sample shall be taken from each strand. The polished face shall be longitudinal to the direction of rolling.

Fields with sizes or numbers of all types of inclusions intermediate between con? The worst? Two thirds of all specimens and at least one from each ingot tested, or from the? Grain Size 8. Cold-Finished Tubes 0. Hardenability 9. Decarburization and Surface Imperfections Decarburization shall be measured using the microscopical methods described in Test Methods E Inspection All tests and inspections shall be made at the place of manufacture, unless otherwise agreed upon. Special requirements agreed to at the time of purchase must be noted on the certi?

When so included, a supplementary requirement shall have the same force as if it were in the body of the speci? Titanium Content S1. Residual Elements S2. The number and location of samples shall be by agreement between the purchaser and manufacturer.

Magnetic Particle Method S4. The magnetic particle method measures bearing steel cleanliness by evaluating the total length of macro-inclusions for a stated area or per unit area. The sum of all lengths for each specimen shall be determined and expressed as total length per area inspected.

The average total length per area inspected of all six specimens shall be agreed upon between manufacturer and purchaser. Banding S5. The sample shall be hardened and in the as-quenched condition. Micro-hardness measurements are to be taken using loads of g or higher. Microstructure S6. Calculated Hardenability S7. The method used shall be agreed upon between the purchaser and the steel supplier at the time of inquiry and order.

Sulfur Requirement for Machinability S8. Sample Reduction Ratio S9. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.

Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.

Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phone , fax , or service astm.


ASTM A534 Grade 8620H

Historical Version s - view previous versions of standard. More A This specification covers standards for carburizing steels to be used in anti-friction bearings. Materials shall conform to carbon, manganese, phosphorus, sulfur, chromium, nickel, molybdenum, copper, oxygen, and aluminum contents. Materials shall adhere to inclusion ratings set for thin and heavy series. Grain size and hardenability requirements shall be followed. Decarburization and surface imperfections of hot-rolled, cold-finished, or annealed bars and tubes shall not exceed specified limits as measured through microscopical methods.


ASTM A534 5120H ASTM A534


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